Combination vise and screw-cutter



2 Sheets-Sheet 1. l

(No Model.)

W.,B. MBLHORN. GUMBINATION VISE AND SCREW GUTTER. No. 576,873.

Patented Feb. 9, 1897. .5

INVENTOR, I v

TK: NURS PYERS CO PHOTO-LITRO.. WASHINGTON. D, C

(No Model.) 24 Sheets-Sheet'.A 2.

W. E. MELHORN. v COMBINATION VISE AND SCREW CUTTER.

Patented Peb. 9, 1897.

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y UNITED. STATES `PATENT OFFICE.

IVILLIAM E. MELHORN, OF KNOXV ILLE, PENNSYLVANIA, ASSIGN OR OF ONE- HALF TO V. Q. HICKMAN, OF PITTSBURG, PENNSYLVANIA.

COMBINATION VISE ANDSCREW-CUTTER.

SPECIFICATION forming part of Letters Patent N 576,873, dated February 9, 1897.

I Application filed October 5,1896. Serial No. 607.970. (No model.)

' To all whom it may @l1/worn: lar base-plate provided on its upperface with Be it known that I, WILLIAM E. MELHORN, lugs 3, to which are hinged the vise-supports a citizen of the United States, residing at h In the inner upper ends of these hinged Knoxville, in the county of Allegheny and supports 4 are the gripping-jaws 5, properly 55 5 State of Pennsylvania, have invented or disshaped and interiorlycorrugated, as` shown coveredk a new and useful Improvement in in Fig. 3, tofirmlygraspapipe a, (indicated by a Combination Vise and Screw-Cutter, of dotted lines in Fig. 6.) Adivided clamp-arm which the following is a full, clear, and exact 6 is secured to the top of one' of the supports description, reference being had to the acby the same bolt holding` the grip, while 6o 1o companying drawings, forming part of this through an enlargement or boss on the square specification, in whichend 7 of the clamp-arm a temper-screw 8 is Figure 1 is a side elevation of my improved tapped, its inner end bearing against the oppipe vise and threader. Fig. 2 is a front eleposite grip, also similarly pivoted. i vation thereof. Fig. 3 isa plan View. Fig. When the temper-screw is applied, pressure 65 i 5 is a detached detail view showing a sheavewill be exerted equally on each side by reason wheel secured to the driving-shaft. Fig. 5 is of the construction of the clamp, `and owing a sectional plan view below the line V V of to the fact that the supports 4 are pivoted at Fig. 1. Fig. 6 is a vertical sectional view the bottom equidistant from the center, and -taken on the line VI VI of Fig. 3. Fig. 7 is to such equal pressure the pipe embraced by 7o zo a face view of the under side. Fig. 8 is a the vise will always assume and retain a censimilar View, but `showing a modiiication in tral positionin relation to the other parts of the means for securing the cutting-die in pothe machine. sitiOn. Fig. 9 is a detached detail view in Supported by four bolts 9, extending from y y perspective of one of the die-holding blocks. the main plate 2, is a housing 10, made in two 75 25 Fig. 10 is a face view of a modified form of parts and secured together by screws or rivcutting-die. Fig. 11 is a partial detached ets through the bolt-lugs 11, which housing edge View thereof. Fig. l2 is an edge view contains the central revolving die-holder 12, in elevation of the die shown in Fig. 10, parts having an upwardly-extending hollowr neck ofthe operative mechanism of the machine 13, externally threaded, of the same pitch as 8o `3o being-shown therewith. Fig. 13 is an enthe thread desired to be cut, passing through larged cross-sectional view taken on the line a central circular aperture in the plate 2. XIII XIII of Fig. 10. Fig.- 14C is a face view An expansible nut vle, made in two parts, of the cutting-0E device. Fig. l5 is an enpivoted together and to the main plate 2 at larged cross-section through Fig. 14 on the 15, serves to engage the threads ot' the neck 85 3 5 line XV XV thereof. Fig. 1G is a cross-sec# 13 when secured in engagement with the 'tion on the line XVI XVI of Fig; 14. threads bythe thumb-screw 16, a coiled com- Similar numerals of reference refer to like pressed spring 17 -opening the nut whenr the parts wherever used throughout this speciiiscrew is reversed, as shown in Fig. 5. cation. In Fig. G thenut is shown in engagement 9o v` Y o My invention consists of a portable pipe with the threads of the sleeve.

vise and threader comprised. in one tool and Within the sleeve a hollow bushing 1S fits adapted to be applied to and operated on a snugly, and several of these bushings arev pipe without requiring its removal to and preferably provided of varying diameters to p from an operating location, thereby greatly suit different sizes of pipe. L 95 45 -facilitating and cheapening the work of cut- The thread-cutting die 19of ordinary conting threads in the field. struction, is held within the revolving die- It also consists in mechanism for cutting oft holder 12 by means of a plate 20, secured on and in anadjustable thread-cutting attachthe bottom oi' the holder by screws or bolts, ment, as shall be more fully hereinafter set the die tting snugly into a square recess 2l loo 5o forth. in the body of the holder and flush with its Referring now to the drawings, 2 is a circubottom. An alternative construction is illustrated in Figs. Sand 9, in which the opening 21 is circular and the square die is held in position by oppositely-located segmentalshaped blocks 22, secured in position by bolts passing through holes 23 and tapped into the face of the holder.

It will be seen that the corners of the die correspondwith the corners made by the face of the blocks and the circular inner edge of the opening 21. The round opening is also more easily adapted to receive the circular die and cutting-ott tool illustrated in Figs. 10, 12, and 14, and it is so made in order to provide for such additional parts.

The revolving die-holder 12 is provided with a series of Worm-gear teeth 24, meshing into a driving Worm-Wheel 25, mounted on a shaft 26 within a hollow box extension 27 of the housing-10.

Ordinarily the shaft 26 is provided with square ends, so that itmay be turned by a suitably'shapedr crank or Wrench from eitherl side. It" desired, however, a sheave-Wheel 28 may be secured to the shaft, whereby it may be'driven by power, as shown in Fig. 4.

The die-holder shown in Fig. 10 is com-v posed of two scmicircular basefplates 29, rcintorced on the bot-tom with correspondinglyshaped plates 30 and provided with a circular cover-plate 3l, the whole structure being bolt ed to the revolving die-holderby bolts 32, passingV through radial slots in plate'31 and between the meeting'faces of' the base-plate 29 and plates 30 with suiiicient clearance for adjustment of th'ese'plates.

At opposite sides of the plate 31 are cam'- gro'o'ves'34, through which pass th umh-screws into the base-plates.

The rotation of the plate 31 will operate to close'or open th'e base-plates 29, and also the therein-mounted thread-cutting dies' 37, by reason ofA the action of the cam-faces of the grooves 34 upon the bolts 35.

Adjusting set-screws 51 are provided in the base-plates 29, by which the limit of inward movement may be very accurately gaged, and in case of'wear of the cutting-dies such Wear may be compensated'for by setting in the screws.

The plate'. 31 may be turned by means of lugs 36, and such turningv action will cause the' base-plates and their contained threadcutting dies 37 to be adjusted very accurately to an exact gage', when the th umh-sere Ws may be turned down and the parts'will remain in such fixed position.

The thread-cutting dies 37 are mountedin transverse grooves oppositely located in the base-plates,overarching lugs 38 connecting the opposite sides' and containing set-screws 39, the points of which enter holes' 40 in the tops ofthe dies, regularly spaced to correspond to the desired gage of thread, and hold' the dies firmly in position.

Any slight variationA due to Wear or other causes: may be compensated for in the Way already described;

The cutting-.oit die (shown in Fig; 14) consists oi a circular base-'plate 411,- adapted to be set'in'to the circular'opening of the housing 12 and secured thereto by bolts through the holes 23 and having at one side a reinforced slideway 42, within which is mounted the cutter-holder 43, to which is secured in an y desired orpreferred manner the cutter 44.

The cutter-holder is adjusted toward and from the center by means of a temper-screw 45,- mounted in a lu g 46 and engaging athreaded boss 47, projecting upwardly from the cutter-holder. y

It will'be seen' that suitable circular open ings 48 are left in the center of the adjustable die holder and cutter to permit of the passage of the pipe.

rPhe operation is-as follows After having inserted'the die 19 of propeugage .or having adjusted the die shown in Fig. 10 to proper size and having inserted the bushing-,18 ot' correspon ding diameter for the outside ofthe pipe, the housinghaving been-set out to the limit of its extension against the heads of the bolts 9, the eXpansible nut 14 is then clamped around the threaded neck 13, and the end of the pipe is inserted between the grippingjaws 5, through the bushing 1S, towardth'e die, and into contact With the thread-cutters. The gri ppin g-jaW's are then closed by turning the temper-screw S until the pipe is Vir-mly grasped and held against rotation. Rotary motion is vthen transmitted to the die-holder 12 through'th'e worm-gearing bynieans of a crank applied to the shaft 26, when thed'ic will commence' to cut a thread upon-thepi-pc.

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By reason of the expansible nut 14 being held stationary upon-the'plate 2 by thepivotal bolt 15, the threaded sleeve 13, integral and revolving With the'holder, will-cause the holder and die and the surrouriding-housing to advance upon the pipe, the pitch-ot the thread being cut corresponding to that ofthe sleeve 13. This operation is Vcontinued until the thread has been cut'for sufficient length, the bolts 9 allowing for enough travel, when the die may be reversed and the pipe Withdrawn. The construction and arrangement of the parts is very strong and' compact, While the wormgearing gives great power, andrea thread may beY cut in a comparatively short IIO time in a very perfectandaccurate manner.;

The construction of the gripping-jaWsa-nd the centeringbushing insure perfect' alineF ment, and When the machine is adjusted for the desired thread a large amount of work can be done rapidly and accurately.

The advantages of my invention will be appreciated by those skilled in thevar-t,v and it is especially adapted for suchworklasflaying pipe-lines in a trench, ttc., wherethethreadsv lnay be cut Without removing the! pipe, the machine bein g. comparatively light and portable and easilyL operated by one man.

Changes and modificationsV maybe made in its construction by the skilled mechanic without departing from my invention, asldo a pair of gripping-jaws mounted on swinging arms hinged to the base, and a rotatable dieholder movably mounted upon the base, substantially as set fort-h.

2. A screw-cutter comprising a base with a central opening therethrough, a pair of gripping-jaws mounted on swinging arms hinged to the base, and a rotatable die-holder movably mounted upon the base provided with a central hollowr extension passing through the base, substantially as set forth.

3. A screw-cutter comprising a base with a central opening therethrough, a pair of gripping-jaws mounted on swinging arms hinged to the base, and a rotatable die-holder movably mounted upon the base provided with a central hollow threaded extension passing through the base, with a nut secured to the base and engaging such threaded extension, substantially as set forth. V

4. A screw-cutter comprising a base with a central opening therethrough, a pair of gripping-jaws mounted on swinging arms hinged to the base, and a rotatable die-holder movably mounted upon the base provided vwith a central hollow threaded extension passing through the base, a two-sided divided nut pivotally secured to the base and engaging the threaded extension, with means for closing the nut upon the threaded extension, substantially as set forth.

5. In combination with a base and a rotatable die-holder movably mounted thereon 5. the

gripping-vise comprising arms pivoted to the base, gripping-jaws pivoted to the arms, a clamp-arm pivoted to one ofthe arms and gripping-jaws, and having a temper-screw bearing against the other jaw, substantially as set forth.

6. In combination with a central base, a pair of gripping-jaws mounted on swinging arms hinged to the base, and a rotatable die-holder movably mounted upon the base provided with a central hollow threaded extension passing through the base; a divided hinged nut pivotally secured to the base composed of two independently-movable separable threaded n halves designed to embrace the threaded extension, substantially as set forth.

7. In combination with a central base, a pair of gripping-jaws mounted on swinging arms hinged to the base, and a rotatable dieholder movably mounted upon the base provided with a central hollow threaded eXten- Vsion passing through the base; a divided hinged nut pivotally secured to the base coinposed of two independently-movable separable threaded halves designed to embrace the threaded extension, and provided with means for closing the threaded halves upon` the threaded extension, substantially as set forth;

8. In combination with a base and a pair of gripping-jaws pivotally mounted thereon; a housing movablyl mounted on the base, a rotatable die-holder inclosed in the housing provided with worm-teeth on its periphery and a Worm-gear meshing therewith, mounted in the housing and provided with a powershaft, substantially as set forth.`

9. In combination with a rotatable dieholder having a circular depressed cavity for the die, adjustably mounted on a base, and means for rotating the die-holder, and a rectangular die mountedtherein segmental holding-blocks provided with a curved face corresponding to the interior edge of the cavity, and a straight face bearing against the edge of the die, with means for securingthe blocks to the depressed face of the die-holder, sub-` stantially as set forth.

10. In combination with a rotatable dieholder having a circular depressed cavity for the die, adjustably mounted on a base, and means for rotating the die-holder; the adjustable die composed of divided semicircular bases, thread-cutters mounted therein, a camplate mounted on the die-holder provided with cam-grooves engaging bolts in the bases, substantially as set forth.

l1.. In combination with a rotatable dieholderhaving a circular depressed cavity for the die, adjustably mounted on a base, and means for rotating the die-holder; the ad- `justable die composed of divided semicircu- 'lar bases, 'thread-cutters mounted in suitable transverse grooves, and lugs provided with pointed set-screws bearin g in regularly-spaced holes in the thread-cutters, a cam.- plate mounted on the die-holder provided with cam-grooves engaging bolts in the bases', and means for securing the parts together and to the die-holder, substantially as set forth.

12. In combination with a rotatable dieholder having a circular depressed cavity for the die; a circular plate provided with a cutter mounted in an adjustable slide having a threaded lug engaged by a temper-screw mounted in the circular plate, .with means for securing the plate to the die-holder, substantially as set forth.

In testimony whereof I have' hereunto set my hand this 1st day of August, 1896.

' WILLIAM E. MELHORN.

Witnesses:

JOHN L. RALPH, C. M. CLARKE.

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